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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
231

Výpočet chlazení transformátoru / Calculation of transformer cooling

Hetflajš, Martin January 2012 (has links)
This master´s thesis deals with influence of forced air flow from the ventilators on the power transformer cooling. For this analysis was used simulation software ANSYS CFX, that uses the finite volume method for calculations of dynamic properties of liquids. In the introduction of the thesis is presented the basic terminology of fluid flow, temperature fields and theory of transformers. The simulation is divided to the analysis of flow through the left and right radiator models.
232

Modelování technologických kroků kontaktování čipu mikrodrátkem / Modeling of wirebonding technological steps for chip connection

Houserek, Jiří January 2013 (has links)
This work deals with a theoretical analysis of contacting semiconductor chips using wire-bonding method. There are mentioned basic types of chips packages and their contacts. In the thesis is also described software Ansys. The number of the mechanical stress and deformation simulation within micro-wire during thermocompress process were made.
233

Analýza chlazení koncentrátorového fotovoltaického článku / Analysis of the photovoltaic cell cooling

Hřešil, Tomáš January 2013 (has links)
This project solves the problem of cooling the photovoltaic cell. Solar cell was modeled according to a real model in SolidWorks, and subsequently created the model was simulated in SolidWorks Flow Simulation and Ansys Fluent. The use of both systems allow a comparison of their possibilities in the field of heat transfer and their suitability for the case. The conclusion summarizes the first results and outline further developments cooling design to optimize the performance of the solar cell.
234

Vliv tvaru sacích kanálů na čerpání u scintilačního detektoru / The effect of the shape of the intake ports for pumping in a Scintillation detector.

Flídr, Karel January 2015 (has links)
The thesis is concerned with the design of the shape of suction canals used for pumping in the scintillation detector. The goal is to perform analysis of the model of the detector according to the current conception and then perform an optimalisation of the suction canals as per demands to their function. In the beginning of the thesis the history of the microscope and electron microscopy is described. The next chapter is focused on a more detailed description of ESEM. The following charter is dedicated to describing the scintillation detector.The thesis recounts the kinds of liquid flow. In conclusion the programs SolidWorks and Ansys Fleunt are described. Next part of this thesis describes in detail parameters‘ settings of simulation calculation. Following chapter introduces designed changes of suction channels shape and its results are shown and described.
235

Dynamické analýza štíhlé mostní konstrukce s ohledem na působení větru / Dynamic analysis of a slender bridge construction with respect to wind actions

Prokop, Filip January 2012 (has links)
This work is focused on the dynamic effects with regard to impact of wind on a slender bridge structure, namely a variant of an overhead footbridge for pedestrians and cyclists, over a river. Attention is focused on finding the so-called default steady state, as well as modal analysis, where owen frequencies are calculated, which is the basis for further dynamic assessment. The main part is focused on modeling in a fluid field of ANSYS CFX, where the effects of wind on the structure are defined and calculated. The goal of the work is to make a dynamic response to vortex excitation and, on the basis of analysis, to assess the fatigue design.
236

Analýza působení větru na štíhlé stavební konstrukce / Analysis of wind effect on slender engineering structures

Tomeček, Petr January 2014 (has links)
Master thesis deals with the analysis of wind effect on high slender engineering structures. There are explained important knowledge of the flow theory and compared each turbulent models according to relation of Reynolds and Strouhal number. The point of separation i salso defined. All necessary calculations are made in the ANSYS systém.
237

Deformačně-napěťová analýza povrchové náhrady kyčelního kloubu / Strain-stress analysis of the surface replacement of the hip joint

Vosynek, Petr January 2008 (has links)
Today is the surface hip repacement very often surgery becouse of new studies and improvements. For young and active people it's the best way to delay implantation of a total hip replacement. The objective of this study was to perform finite-element analyses of computational model of the partial/total surface replacement, conventional partial/total replacement and physiological hip joint. We obtained strain-stress states from these analyses. All results were compared one another and then were confronted with results of the physiological hip joint. The three-dimensional computational model consists of these components: sacral, pelvic and femoral bone, muscles, artificial socket, and surface hip replacement. We were using FEM system ANSYS. The geometrical models of bones were generated by means of computed tomography (CT) images. The FE model of bone reflects two types of the bone tissues (trabecular and cortical bone) and muscles which are important when standing on one leg. The model of the muscle corresponds to isometric contraction. The implants material and bone tissues were modelled as isotropic linear elastic material. The model was loaded by force, corresponding to load by standing on one leg.
238

Vyšetření dynamického namáhání ventilového rozvodu OHV / Calculation of OHV-Valve Gear Dynamic Stress

Opluštil, Tomáš January 2008 (has links)
This diploma thesis deals with investigation of dynamic straining valve OHV for four-valve head diesel engine Zetor 1505 – 90 kW. The calculation is performed analytically in mathematic software MathCad and MBS software ADAMS/Engine 2005. Also in this diploma thesis is from results obtained from MBS system perfomed stressed analysis valve_rocker arm gear divorce method final elements (MKP) in program ANSYS 10.
239

Návrh vzduchem chlazeného Wankelova motoru / Design Study of Air Cooled Wankel Engine

Šeda, Petr January 2008 (has links)
Diploma thesis deals with calculation and design study of air-cooled Wankel engine and simple mechanical stress of its main parts.
240

Modelování okluzního efektu při aplikaci ušních sluchadel / The application of earphones- modelling of the oclusion effect

Vrtěna, Jan January 2008 (has links)
Disscusion of influencis of shape and dimension of human ear-canal in gain characteristic inclucing pressure wave applied on tympanic membrane in earphone implementation.

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